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CVE-2023-39517

8.2 · HIGH

Joplin is a free, open source note taking and to-do application.

Published Jun 21, 2024CWE-79EPSS 0.48%

Overview

CVE-2023-39517 is a high-severity vulnerability. It was published on June 21, 2024 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Joplin is a free, open source note taking and to-do application. A Cross site scripting (XSS) vulnerability in affected versions allows clicking on an untrusted image link to execute arbitrary shell commands. The HTML sanitizer (`packages/renderer/htmlUtils.ts::sanitizeHtml`) preserves `<map>` `<area>` links. However, unlike `<a>` links, the `target` and `href` attributes are not removed. Additionally, because the note preview pane isn't sandboxed to prevent top navigation, links with `target` set to `_top` can replace the toplevel electron page. Because any toplevel electron page, with Joplin's setup, has access to `require` and can require node libraries, a malicious replacement toplevel page can import `child_process` and execute arbitrary shell commands. This issue has been fixed in commit 7c52c3e9a81a52ef1b42a951f9deb9d378d59b0f which is included in release version 2.12.8. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdeveloper.mozilla.org/en-US/docs/Web/HTML/Element/iframe#sandboxGitHubgithub.com/laurent22/joplin/commit/7c52c3e9a81a52ef1b42a951f9deb9d378d59b0fGitHubgithub.com/laurent22/joplin/security/advisories/GHSA-2h88-m32f-qh5mRefdeveloper.mozilla.org/en-US/docs/Web/HTML/Element/iframe#sandboxGitHubgithub.com/laurent22/joplin/commit/7c52c3e9a81a52ef1b42a951f9deb9d378d59b0fGitHubgithub.com/laurent22/joplin/security/advisories/GHSA-2h88-m32f-qh5m

How CyberStrike helps

Frequently asked questions

What is CVE-2023-39517?

CVE-2023-39517 is a high-severity vulnerability. It was published on June 21, 2024 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2023-39517?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-39517?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-39517?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-39517 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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